holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.

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Source

Pure Python 3 MTProto API Telegram client library, for bots too! (archived)

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Maltego Telegram

OSINT Maltego Transforms for investigating Telegram channels, groups, and users, including deanonymization via stickers, forwarded messages, similar channels, deleted posts, and more.

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SangMataInfo_bot

forward a message from the user and find out the history of their name in Telegram

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TeleTracker

TeleTracker is a simple set of Python scripts designed for anyone investigating Telegram channels. It helps you send messages quickly and gather useful channel information easily.

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TGStat

one of the largest directories of Telegram channels, which has detailed information about the growth of the audience, its engagement and mentions of a particular channel in various sources.

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MotherSearchBot

Google-like Telegram search.

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Telegram Finder

A tool to find Telegram users by their phone number, linkedin url or email.

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Telegram Nearby Map

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